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Energy-saving process and system for nitrite regeneration byproduct dilute nitric acid in ethylene glycol preparation

A technology of nitrite and dilute nitric acid, applied in the preparation of nitric acid, hydroxyl compounds, preparation of organic compounds, etc., can solve the problems of nitrite regeneration, low system energy consumption, etc.

Inactive Publication Date: 2019-05-10
SOUTHWEST RES & DESIGN INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0021] The object of the present invention is to aim at the problem of nitrite regeneration in the process of producing ethylene glycol from coal or syngas, and propose an energy-saving process and system for recycling dilute nitric acid as a by-product. The process and system of the present invention have low energy consumption and can reduce Discharge of acidic wastewater to reduce the treatment cost of acidic wastewater from syngas to ethylene glycol

Method used

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  • Energy-saving process and system for nitrite regeneration byproduct dilute nitric acid in ethylene glycol preparation
  • Energy-saving process and system for nitrite regeneration byproduct dilute nitric acid in ethylene glycol preparation
  • Energy-saving process and system for nitrite regeneration byproduct dilute nitric acid in ethylene glycol preparation

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Experimental program
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Effect test

Embodiment 1

[0047] 5% of the gas material is diverted from the inlet of the nitrite regeneration reactor R-01, and the gas flow rate is 2262.5Nm 3 / h, wherein NO is 9.4v%, heated to 50°C by gas heater E-03; from the bottom of the nitrite regeneration reactor R-01, the liquid phase material containing nitric acid is passed through the bottom of the regeneration reactor tank liquid pump P-01 1.9wt%, ethanol 57.2wt%. The liquid phase material is sent to the liquid heater E-04 at 12.8t / h and heated to 50°C. The heated gas phase material and liquid phase material enter the dilute nitric acid reduction reactor R-02 in the way of co-current contact. R-02 is equipped with Pd-Pt-Rh / AC catalyst, and the space velocity of the liquid phase material is 3.5h -1 , gas phase material space velocity is 3000h -1 , the operating pressure of R-02 is controlled to be 0.1MPaA. After the reaction, the liquid phase material is sent to the alkanol recovery tower T-01 through the delivery pump P-03, and the nitr...

Embodiment 2

[0049] Split 2% gas material from the inlet of nitrite regeneration reactor R-01, the gas flow rate is 905Nm 3 / h, which contains NO as 9.4v%, is heated to 85°C by gas heater E-03; the liquid phase material containing nitric acid is transferred from the bottom of the nitrite regeneration reactor R-01 through the regenerative reactor tank liquid pump P-01 1.9wt%, ethanol 57.2wt%. The liquid phase material is sent to the liquid heater E-04 at 12.8t / h and heated to 85°C. The heated gas phase material and liquid phase material enter the dilute nitric acid reduction reactor R-02 in the way of co-current contact. R-02 is equipped with Pd-Pt-Rh / AC catalyst, and the space velocity of the liquid phase material is 1.0h -1 , the gas phase material space velocity is 1200h -1 , the operating pressure of R-02 is controlled to be 0.5MPaA. After the reaction, the liquid phase material is sent to the alkyl alcohol recovery tower T-01 through the delivery pump P-03, and the nitric acid conten...

Embodiment 3

[0051] 8% of the gas material is diverted from the inlet of the nitrite regeneration reactor R-01, and the gas flow rate is 905Nm 3 / h, which contains NO as 9.4v%, is heated to 110°C by gas heater E-03; the liquid phase material containing nitric acid is transferred from the bottom of the nitrite regeneration reactor R-01 through the regenerative reactor tank liquid pump P-01 2.2wt%, methanol 59.4wt%. The liquid phase material is sent to the liquid heater E-04 at 12.8t / h and heated to 110°C. The heated gas phase material and liquid phase material enter the dilute nitric acid reduction reactor R-02 in the way of co-current contact. R-02 is equipped with Pd-Pt-Rh / AC catalyst, and the space velocity of the liquid phase material is 0.5h -1 , the gas phase material space velocity is 500h -1 , the operating pressure of R-02 is controlled to be 1.0MPaA. After the reaction, the liquid phase material is sent to the alkanol recovery tower T-01 through the delivery pump P-03, and the n...

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Abstract

The invention belongs to the technical field of ethylene glycol preparation and provides an energy-saving process and system for nitrite regeneration byproduct dilute nitric acid in ethylene glycol preparation. In a process of preparing ethylene glycol from coal or synthesis gas, a dilute nitric acid reduction reactor is added before a liquid-phase product of reaction in a nitrite regeneration reactor enters an alkyl alcohol recovery tower, the liquid-phase product of reaction in the nitrite regeneration reactor and a nitric-oxide-containing mixed gas jointly enter the dilute nitric acid reduction reactor, and by catalytic reaction in the dilute nitric acid reduction reactor, the concentration of nitric acid in a liquid-phase material discharged from the dilute nitric acid reduction reactor is decreased to 0.1wt% or below. The dilute nitric acid reduction reactor is added, the nitric-oxide-containing mixed gas is fed into the dilute nitric acid reduction reactor, catalytic reaction between nitric oxides in the mixed gas and nitric acid and alkyl alcohol in the liquid-phase product of the regeneration reactor is realized, and the concentration of nitric acid in the liquid-phase material discharged from the dilute nitric acid reduction reactor is decreased to 0.1wt% or below.

Description

technical field [0001] The invention belongs to the technical field of ethylene glycol preparation, and specifically relates to an energy-saving process and system for dilute nitric acid by-product regeneration of nitrite in the preparation of ethylene glycol. Background technique [0002] Ethylene glycol is an important organic chemical raw material, which is mainly used in the production of polyester and antifreeze, and can also be used in the production of unsaturated polyester resins, alkyd resins, surfactants and emulsifiers. The apparent consumption of ethylene glycol in my country ranks first in the world, but due to the limitation of petroleum resources, the production capacity of ethylene glycol in my country is far from meeting the consumption demand, and the external dependence of ethylene glycol in my country has been maintained at about 70%. Starting from my country's resource endowment, in recent years, my country has actively promoted coal / synthesis gas (CO+H ...

Claims

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Application Information

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IPC IPC(8): C07C31/20C07C29/152C01B21/40
Inventor 李扬李文龙宋元江胡玉容王科许红云
Owner SOUTHWEST RES & DESIGN INST OF CHEM IND